I'm very happy with my XMC2 despite what so many people say around here about Emotiva. The latest firmware (2.1) is stable, fast and bug free in my setup and sounds amazing.
HTP-1 seems pretty stable these days but as most processors it has it own quirks and downfalls. Overall firmware wise they seem one of the better sorted units from what I've seen.
A lot of people love to bash Emotiva for the bugs and glitches but so many other highly configurable and complex AVR's have just as many problems, take the JBL SDP-55 for example... The firmware on that is a complete mess.
It's exactly the same platform so any fixes in the RMC firmware is incorporated into the XMC2 by default. It's one firmware package for the XMC2, RMC1L and the RMC.